Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a perda média quando os pontos foram 545?
 ###Tabelas: CREATE TABLE regional_vote__ (regional_vote___id AUTO_INCREMENT PRIMARY KEY, Date(s) conducted VARCHAR, Cons VARCHAR, Plaid Cymru VARCHAR, Lib Dem VARCHAR, UKIP VARCHAR, Green VARCHAR, Others VARCHAR, Lead VARCHAR) CREATE TABLE by_country_tally (by_country_tally_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Country/Territory VARCHAR, Mister International INT, 1st runner-up INT, 2nd runner-up INT, 3rd runner-up INT, 4th runner-up INT, Semifinalists INT, Total INT) CREATE TABLE most_viewed_channels (most_viewed_channels_id AUTO_INCREMENT PRIMARY KEY, Position INT, Channel VARCHAR, Launch date INT, Owner VARCHAR, 2005 VARCHAR, 2006 VARCHAR, 2007 VARCHAR, 2008 VARCHAR, 2009 VARCHAR, 2010 VARCHAR, 2011 VARCHAR, 2012 VARCHAR, 2013 (p) INT) CREATE TABLE 1900-1912 (1900-1912_id AUTO_INCREMENT PRIMARY KEY, Average population (x 1,000) INT, Live births INT, Deaths INT, Natural change INT, Crude birth rate (per 1,000) INT, Crude death rate (per 1,000) INT, Natural change (per 1,000) INT) CREATE TABLE top_league_table (top_league_table_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Order VARCHAR, Played INT, Drawn INT, Lost INT, Penalties INT, Points For INT, Points Against INT, Points Diff INT, Coach VARCHAR)  
SELECT AVG Lost FROM top_league_table WHERE Points For = 545